As we depart from Toronto, we drive past the CN Tower. The CN stands for Canadian National. The CN Tower was built in 1976 by Canadian National to demonstrate the strength of Canadian industry by building the tallest tower in the world. On February 6, 1973, ground breaking for the tower took place. The tower took 40 months to build, and opened to the public on June 26, 1976. After its completion in 1976, the CN Tower held the record as the tallest freestanding structure for over three decades, standing at 553.33m (1,815ft5 in). It remains the tallest in the Western Hemisphere. In 1995, the CN Tower was classified as one of the Seven Wonders of the Modern World by the American Society of Civil Engineers. Some of the attractions at the Skylon Tower include: 360 (The CN Tower’s revolving restaurant), North America's first and the world's highest glass floor paneled elevator, and EdgeWalk (the world’s highest full circle hands-free encircling the top of the CN Tower’s main pod, 356m, (1168 ft, 116 stories) above the ground.).The antenna that tops the CN Tower is a communications antenna that broadcasts transmission for UHF, VHF television, AM, FM, DAB Radio, microwave transmissions, fixed mobile systems, as well as wireless service providers use the CN Tower.